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The EGR is an exhaust gas recirculation device used for the purpose of lowering emissions. The purpose of the EGR is to allow a certain amount of exhaust to return and be mixed with the incoming fuel into the cylinders at cruising speed. This helps to cool the cylinders, allowing for a higher degree of ignition advance to burn more of the fuel. The EGR cannot function at an idle, or it will cause a very rough running engine or stalling. It is meant to actuate at around a constant 2,000 rpm. This is accomplished through an EGR vacuum control solenoid.
